Exterior surface of rear wheel unit for a motorcycle to tricycle conversion kit



FIG. 1 is a perspective view of an exterior surface of rear wheel unit for a motorcycle to tricycle conversion kit showing our new design;

FIG. 2 is a right side elevation view;

FIG. 3 is a left side elevation view;

FIG. 4 is a front elevation view;

FIG. 5 is a rear elevation view; and,

FIG. 6 is a top plan view.

The broken lines shown in all view of the drawing are for illustrative purposes only and forn no part of the claimed design. 

The ornamental design for an exterior surface of rear wheel unit for a motorcycle to tricycle conversion kit, as shown and described. 